Muck Boots Standard Features:• A 100% waterproof CR-foam bootie for plenty of support and slipper-soft molded comfort in the footbed. The sturdiness and stretch of the CR-foam bootie makes it easy to step into the shoe or boot without having to pull it on.• A removable 6mm Nitracel EVA sockliner for superior comfort, breathability, and moisture wicking.• A breathable Airmesh lining to prevent overheating, keeping feet dry and comfortable.• A vulcanized rubber shell for light weight and extreme durability.• Natural rubber upper overlays for long-wearing comfort, extra waterproofing, and easy cleaning.